This book was difficult. The difficulty was no doubt compounded by my listening to the audiobook (read by the author) as opposed to seeing the words (and figures) on a page. Losing the visual side of reading made some of the math even more difficult to understand that it would have been on it own. It was also difficult for me to get into the long descriptions and analysis of lotteries, which I don’t care about, and elections, which I do care about but find frustrating. But I still loved the way that it was written—colloquial, full of the history of mathematics, and focused on the big picture issues of why math matters. I especially enjoyed the end where Ellenberg focused on the way learning requires the to hold two contrary opinions simultaneously, or, to try to prove your theorem by day and disprove it by night.